Rotatable plate and impact means for a scrap fragmentizing machine

ABSTRACT

A rotatable plate and impact means for a scrap fragmentizing machine. The impact means comprises a stud including an enlarged head portion protruding from the scrap engaging surface of the plate and a shaft portion received within a bore formed in the plate. The head includes a portion countersunk into the surface of the plate to facilitate the transfer of impact forces from the head to the plate.

United States Patent Bogle 1 July 25, 1972 s41 ROTATABLE PLATE AND IMPACT 791,328 5 1905 Davenport ..241 191 MEANS FOR A SCRAP 1,085,861 2/1914 l-laughton ..241/291 FRAGNIENTIZING MACHINE 2,322,460 6/1943 Mankoff ..241/ 192 3,561,072 2/1971 Oster et a1 ..241/186 R [72] Inventor: David M. Bogle, Grosse Pointe Farms,

Mlch- Primary Examiner-Granville Y. Custer, Jr. [73] Assignee: Ford Motor Company, Dearborn, Mich. Faulkner and 8" 5 Erickson [22] Filed: March 1, 1971 57 ABSTRACT [2|] Appl' 120,023 A rotatable plate and impact means for a scrap fragmentizing machine. The impact means comprises a stud including an en- 52 us. c1. ..241/300, 241/195, 241/291 larsed head portion p s from the Scrap engaging 51 1m. 01. ..'......B02c 13/28 face of the plate and a shaft p received within a bore [58] Field of Searchmm. ....24l/188 A, 191, 192, 195, 197, formed in the plate. The head includes a portion countersunk 241/277, 278, 291, 296, 300; 29/403 into the surface of the plate to facilitate the transfer of impact forces from the head to the plate. {56] References Cited 4 Claims, 3 Drawing Figures UNITED STATES PATENTS 412,321 10/1889 Burkman ..241/188 A I 2/ Y i I 1 ,5 22 s m o /ll/ JZ 29 I H 3/ 24 3/ 2 "n Z8 INVENTOR DA V/D A4. 5064:

Wax-su ATTORNEYS ROTATABLE PLATE AND IMPACT MEANS FOR A SCRAP FRAGMENTIZING MACHINE BACKGROUND OF THE INVENTION in apparatus are shown in application Ser. No. 787,646 filed l 0 Dec. 30, 1968, now US. Pat. No. 3,561,072, issued Feb. 9, 1971.

The subject invention provides an improved impact stud and mounting means for apparatus such as that identified above. A portion of the stud head is countersunk into the plate so as to transfer a significant portion of the impact forces directly to the plate from the head. This results in increased stud and plate life and reduces both stud and bore distortion.

SUMMARY OF THE INVENTION A scrap fragmentizing machine constructed in accordance with this invention includes an impact stud having a shaft portion and an enlarged head portion. The shaft portion is received within a bore formed in a rotatable plate. One portion of the head protrudes from a surface of the plate while the remaining portion of the head is countersunk into the plate. A fastening means is engageable with the shaft portion to retain the stud within the bore.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top view of a rotatable plate 11 having a plurality of impact studs 12 mounted therein for a scrap metal fragmentizing machine;

FIG. 2 is a cross section taken along line 2-2 of FIG. I of the plate 11 showing two impact studs 12, one of which is rotated 90 relative to the other;

FIG. 3 is a bottom view of a portion of the plate 11.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT FIG. 1 of the drawings illustrates a rotatable circular disc 11 having a plurality of impact projections or studs 12 engageable with scrap metal in a manner described in US. Pat. No. 3,429,022 issued Feb. 25, 1969 and entitled SCRAP RECOVERY PROCESS and US. Pat. No. 3,561,072 issued Feb. 9, 1971, entitled MACHINE FOR DISASSEMBLING COMPONENTS FROM COMPOSITE PRODUCTS.

The impact stud 12 and its mounting in plate 11 are shown in detail in FIG. 2. A shaft portion 13 of the stud is slidingly received in a bore 14 that extends through the plate. The axis of bore 14 is essentially parallel to the common axis of rotation and symmetry of plate 11. Integrally formed with the shaft portion 13 is an enlarged head 16. The head includes a generally rounded portion 17 which protrudes from the upper surface 18 of the plate and is engageable with the scrap metal to cause its disassembly or fragmentization. A conical portion 19 of the head interconnects the rounded head portion and the shaft portion and provides a surface which seats with a corresponding countersink 21 formed in the plate 11.

The plate 11 is a circular disc having parallel surfaces 18 and 22. The end 23 of the shaft portion 13 protrudes from bottom surface 22 and has a rectangularly cross sectioned keyway or channel 24 formed therein. The keyway has an angled lower side 26 which corresponds to an angled side 27 of a tapered key or wedge 28 that is insertable into the keyway. As the key is advanced in the keyway it bears against surface 22 of the plate and side 26 of the keyway to draw the conical surface 19 of head 16 into more forceful engagement with countersink 21. Typically, the key would be driven into place with a hammer and a cotter pin (not shown) would be inserted into one of holes 29 in the key to prevent its withdrawal.

A pair of abutments 31 and 32 extend from surface 22 of the late and provide a slot 33 which prevents the key 28 and stu 12 from turning within bore 14. The abutments may be secured to the plate by welding.

An impact stud constructed of 12 percent manganese steel has been found to be preferable.

OPERATION As is fully described in the patent and the application previously identified, the heads 16 of studs 12 protrude from the upper surface 18 of rotatable plate 11 and engageable with scrap metal to cause its fracture and fragmentization. A typical operational plate velocity is 500 r.p.m. Most of the headon impacts to studs are directed downwardly against the rounded portions 17 of the heads 16, resulting in force vector directions which are nearly normal or actually normal to the conical surface 19. Thus, a substantial portion of the impact force is transferred directly to the plate from the conical surface 19 to the countersink 21. The transfer of a significant portion of the forces in directions substantially perpendicular to the mating surfaces reduces the possibilities of bore enlargement and impact member distortion or failure. A countersink angle of approximately 30 with the axis of the bore has been found to be satisfactory.

The impact member 12 is mounted within bore 14 so that conical surface 19 seats against countersink 21. A key or wedge 28 is then inserted into slot 33 and keyway 24 and driven into a tight frictionally retained fit between the underside 22 of plate 11 and the angled side 27 of the keyway 24, thus placing the shaft portion 13 in tension. A cotter key (not shown) or similar simple fastener is inserted into one of holes 29 in the wedge 28 to prevent accidental withdrawal of the wedge in the event that its normal friction retention failed. A taper angle of 5 on the wedge has proven in practice to provide more than sufficient frictional retention to maintain the position of the wedge.

Modifications and alterations may occur to those skilled in the art which are included within the scope of the following claims.

Iclaim: 1. In a scrap fragmentizing machine having a rotatable said head portion protruding from one surface of said plate,

a portion of said head portion being countersunk into said one surface, fastening means engageable with said shaft portion to retain said stud within said bore. 2. In a scrap fragmentizing machine according to claim 1, said enlarged head having a generally rounded surface protruding from said one surface of the plate. 3. In a scrap fragmentizing machine according to claim 1, the portion of said head countersunk into said plate having a generally conical surface engageable with a corresponding surface of said plate about said bore. 4. In a scrap fragmentizing machine according to claim 3, said conical surface forming an angle of approximately 30 with the axis of said bore. 

1. In a scrap fragmentizing machine having a rotatable plate, an impact stud having a shaft portion and an enlarged head portion, a bore formed in said plate receiving said shaft portion, said head portion protruding from one surface of said plate, a portion of said head portion being countersunk into said one surface, fastening means engageable with said shaft portion to retain said stud within said bore.
 2. In a scrap fragmentizing machine according to claim 1, said enlarged head having a generally rounded surface protruding from said one surface of the plate.
 3. In a scrap fragmentizing machine according to claim 1, the portion of said head countersunk into said plate having a generally conical surface engageable with a corresponding surface of said plate about said bore.
 4. In a scrap fragmentizing machine according to claim 3, said conical surface forming an angle of approximately 30* with the axis of said bore. 